So my 98 z28 has a stage 2 clutch and the clutch pedal stick a bit if you hold it in to long and if it’s in gear it will start to grab and move. Any reason y’all know why.

 

Because this is a common thing, here is a link with a bunch of good info about your situation

https://ls1tech.com/forums/manual-tr...-write-up.html

 

As for the clutch starting to engage after a moment, I had the same issue years ago. My problem was a bad master cylinder that allowed fluid to leak past the seal when the clutch was engaged. Did you measure your clutch clearances when you installed the clutch? Are the hydraulics stock or upgraded?